Sjors,
If there was an alternative way, many of us would use that way. Unfortunately there is only one proper way to stain a pamor blade and that is the use of warangan, with arsenic. Nothing else react as lemon juice with arsenic. Believe me, many of the respectable forummembers tried to stain pamorblades with other solutions, but thus far nobody succeeded to get a result that came in the direction of staining with warangan.
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